Waktu & Sysvar

Metode untuk memanipulasi waktu dan mengakses variabel sistem.

Aktifkan sysvar terlebih dahulu dengan client.svm.withSysvars() sebelum mengakses metode sysvar.

Manipulasi Clock

warpToSlot

warpToSlot(slot: bigint): LiteSVM

Majukan clock ke slot tertentu.

client.svm.withSysvars();

// Check current slot
const before = client.svm.getClock();
console.log("Current slot:", before.slot);

// Warp forward
client.svm.warpToSlot(10000n);

const after = client.svm.getClock();
console.log("New slot:", after.slot);

getClock

getClock(): Clock

Dapatkan nilai sysvar clock saat ini.

const clock = client.svm.getClock();

console.log("Slot:", clock.slot);
console.log("Epoch:", clock.epoch);
console.log("Unix timestamp:", clock.unixTimestamp);
console.log("Epoch start timestamp:", clock.epochStartTimestamp);
console.log("Leader schedule epoch:", clock.leaderScheduleEpoch);

setClock

setClock(clock: Clock): LiteSVM

Timpa sysvar clock. Ambil clock, ubah field-nya, lalu tulis kembali. Gunakan ini saat Anda memerlukan kontrol presisi atas beberapa field clock — misalnya, mengatur epoch atau unix timestamp, yang tidak diperbarui oleh warpToSlot.

const clock = client.svm.getClock();
clock.slot = 1000n;
clock.epoch = 10n;
clock.unixTimestamp = 1735689600n;
client.svm.setClock(clock);

warpToSlot hanya memperbarui slot. Gunakan setClock saat program Anda membaca epoch atau unix_timestamp dari sysvar Clock.

Properti Clock

Property	Type	Description
`slot`	`bigint`	Nomor slot saat ini
`epoch`	`bigint`	Nomor epoch saat ini
`unixTimestamp`	`bigint`	Unix timestamp dalam detik
`epochStartTimestamp`	`bigint`	Awal epoch saat ini
`leaderScheduleEpoch`	`bigint`	Epoch jadwal pemimpin

Rent

getRent

getRent(): Rent

Dapatkan sysvar rent.

const rent = client.svm.getRent();

console.log("Lamports per byte-year:", rent.lamportsPerByteYear);
console.log("Exemption threshold:", rent.exemptionThreshold);
console.log("Burn percent:", rent.burnPercent);

minimumBalanceForRentExemption

minimumBalanceForRentExemption(dataLen: bigint): bigint

Hitung jumlah minimum lamport yang dibutuhkan untuk pembebasan rent.

// Calculate for different data sizes
for (const size of [0n, 100n, 1000n]) {
  const min = client.svm.minimumBalanceForRentExemption(size);
  console.log(`${size} bytes: ${min} lamports`);
}

Jadwal Epoch

getEpochSchedule

getEpochSchedule(): EpochSchedule

Dapatkan sysvar jadwal epoch.

const epochSchedule = client.svm.getEpochSchedule();

console.log("Slots per epoch:", epochSchedule.slotsPerEpoch);
console.log(
  "Leader schedule slot offset:",
  epochSchedule.leaderScheduleSlotOffset
);
console.log("Warmup:", epochSchedule.warmup);
console.log("First normal epoch:", epochSchedule.firstNormalEpoch);
console.log("First normal slot:", epochSchedule.firstNormalSlot);

Reward Epoch

getEpochRewards

getEpochRewards(): EpochRewards

Dapatkan sysvar reward epoch.

const rewards = client.svm.getEpochRewards();

console.log("Active:", rewards.active);
console.log("Total rewards:", rewards.totalRewards);
console.log("Distributed rewards:", rewards.distributedRewards);
console.log("Total points:", rewards.totalPoints);
console.log("Num partitions:", rewards.numPartitions);
console.log(
  "Distribution starting block height:",
  rewards.distributionStartingBlockHeight
);

Informasi Slot

getSlotHashes

getSlotHashes(): SlotHash[]

Dapatkan hash slot terbaru.

const slotHashes = client.svm.getSlotHashes();

console.log("Slot hashes count:", slotHashes.length);
if (slotHashes.length > 0) {
  console.log("First hash:", {
    slot: slotHashes[0].slot,
    hash: slotHashes[0].hash
  });
}

getSlotHistory

getSlotHistory(): SlotHistory

Dapatkan riwayat slot.

const slotHistory = client.svm.getSlotHistory();
console.log("Next slot:", slotHistory.nextSlot);

getLastRestartSlot / setLastRestartSlot

getLastRestartSlot(): bigint
setLastRestartSlot(slot: bigint): LiteSVM

Dapatkan atau tetapkan slot restart terakhir.

const lastRestart = client.svm.getLastRestartSlot();
console.log("Last restart slot:", lastRestart);

client.svm.setLastRestartSlot(500n);

Riwayat Stake

getStakeHistory

getStakeHistory(): StakeHistory

Dapatkan riwayat stake.

const stakeHistory = client.svm.getStakeHistory();
// Returns array of { epoch, entry: { effective, activating, deactivating } }

Menguji Logika yang Bergantung pada Waktu

Gunakan warpToSlot untuk menguji perilaku program yang bergantung pada waktu:

import { createClient, generateKeyPairSigner } from "@solana/kit";
import { litesvm } from "@solana/kit-plugin-litesvm";
import { signer } from "@solana/kit-plugin-signer";

async function testTimeLockedVault() {
  const mySigner = await generateKeyPairSigner();
  const client = createClient().use(signer(mySigner)).use(litesvm());
  client.svm.withSysvars();

  const unlockSlot = 10000n;

  // Setup: Create time-locked account
  // ... set up your account state ...

  // Test 1: Try to withdraw before unlock (should fail)
  const beforeClock = client.svm.getClock();
  console.log("Current slot:", beforeClock.slot);
  // ... attempt withdrawal, expect failure ...

  // Warp time forward past unlock slot
  client.svm.warpToSlot(unlockSlot + 1n);

  // Test 2: Try to withdraw after unlock (should succeed)
  const afterClock = client.svm.getClock();
  console.log("New slot:", afterClock.slot);
  // ... attempt withdrawal, expect success ...
}

Daftar Isi